Casa Font-Ubides (English: Font-Ubides House), also known as the Residencia Monsanto (English: Monsanto Residence) is a historic building located on the north side of Castillo Street in Ponce, Puerto Rico, in the city's historic district. The building dates from 1913. It was designed by the architect Blas Silva. The architecture consists of 19th Classical revival and Art Nouveau architectural styles. The building is of architectural significance for its aggressive incorporation of curvilinear forms and ornaments. The complete preservation of the original architecture of the Monsanto Residence, its unique design amongst the houses of Ponce, and its location within the historic urban core of the city qualify it as one of a series of grand houses and an integral part of the character of Ponce. Significance The Monsanto Residence at Calle Castillo No.34 is an architectural landmark in the city of Ponce. Designed by the well-known architect Blas Silva in 1913, the residence stands out among the great houses of Ponce for its aggressive incorporation of curvilinear forms and ornament. Adapting the curves of the "Art Nouveau" to the persistent Neo-classicism of Puerto Rico and the recently born Creole vocabulary of Ponce, Silva succeeded in creating a movement in architecture which broke away from the traditional forms while remaining within them. The traditional continuous raised verandah along the front facade is broken up into two and twisted out of its usual linearity into the curved forms preserved today. Characteristic of the architecture to abound in Ponce contemporaneous to Castillo 34 is a profusion of appliqué, and eclectic combination and juxtaposition of shapes, particularly curvilinear, and a general ostentation of articulation. Blas Silva was probably the most established of the "wedding-cake architects" and was thus sought after mostly by the "nouveau riche" of the period. Silva's houses are among the richest in Ponce, among which the Monsanto Residence stands put for its circular porches. Other buildings by Blas Silva include the Frau Residence and the Salazar-Candal Residence, both also listed in the NRHP. Physical appearance and description The Monsanto Residence, located at 34 Castillo Street, is a one-storey, detached, masonry and stone building on the north side of the street, between Virtud and Salud Streets, in the Ponce Historic Zone. The house consists of plastered masonry at the living level and pinkstone ashlar at the podium. Excessive ornamentation and exuberance of volumes denominates this house as what is known locally as "wedding